Abstract
New ratings to evaluate impact noise insulation have recently been published as ASTM standards, which are commonly used to evaluate building acoustics measurements in North America. ASTM E3207 defines new ratings for low-frequency impact insulation, defined by the 50-80 Hz third-octave bands. ASTM E3222 defines new ratings for high-frequency impact insulation, defined by the 400-3150 Hz bands. These ratings are based on the two-rating method of evaluating impact noise isolation proposed by the authors [LoVerde and Dong, J. Acoust. Soc. Am. 141 (2017)]. By evaluating the low and high-frequency components of impact noise independently, the proposed ratings perform better than existing ratings in terms of correlating with subjective reaction, designing assemblies, and evaluating products and mitigation measures. Motivations, development, and examples illustrating the use of the new ratings are presented, and suggested classification schemes are discussed.
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